Meniscus Motion and Void Generation Inside Carbon Nanotubes
Meniscus Motion and Void Generation Inside Carbon Nanotubes
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DOI：
10.1021/acs.jpcc.8b06406
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Yutaka Yamada;K. Taguchi;T. Ikuta;A. Horibe;Koji Takahashi
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文献类型：
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作者：
Yutaka Yamada;K. Taguchi;T. Ikuta;A. Horibe;Koji Takahashi
碳纳米管（CNT）的中空内部不仅在纳米毛细管的流速增强方面具有巨大的潜力，而且在可用于药物递送和纳米颗粒输注的材料容器方面也具有巨大的潜力。然而，这些应用集中在液体注入到碳纳米管后，而对填充过程的理解仍然有限。我们进行了毛细管填充实验，使用个别的开放式碳纳米管，这是坚持到离子液体和可视化的扫描透射电子显微镜。结果表明，弯月面停止在碳纳米管，这是不是由卢卡斯-沃什伯恩方程预测。为了解释这种差异，提出了液体和CNT内壁之间的分子间力来提供额外的摩擦力。另外，在CNT内部的液体中观察到空隙。空洞的产生机制是由于纳米颗粒的推进导致沿着碳纳米管内表面的薄液层不稳定而引起的。
The hollow inside of a carbon nanotube (CNT) has great potential not only for flow rate enhancement of nanocapillary, but also for a material container which can be applied for drug delivery and nanoparticle infusion. However, these applications focus on after liquid infusion into CNTs, whereas the understanding of the filling process is still limited. We conducted capillary filling experiments using individual open-ended CNTs, which were stuck into an ionic liquid and visualized by scanning transmission electron microscopy. The results showed that the meniscus stopped inside the CNT, which is not predicted by the Lucas–Washburn equation. To explain this discrepancy, the intermolecular force between the liquid and CNT inner wall was proposed to provide an additional friction force. In addition, voids were observed in the liquid inside the CNT. The generation mechanism of voids was proposed to be induced by the instability of the thin liquid layer along the CNT inner surface caused by the advance of the th...